The source, who was not named in the article, said: “I’ve not worked on a site like that in a long, long time.

“There were people off their heads, drinking cans first thing in the morning before going on site and snorting coke in the toilets.”

Construction giant Mace, which is overseeing the stadium construction, operates a strict drugs and alcohol policy.

Its own employees and other workers and suppliers are subjected to regular random testing.

A spokesperson said: “The health, safety and wellbeing of everybody is, and has always been, a core value at Mace.

“Any suggestion that our rigorous standards around best practice or drugs and alcohol had been broken would be taken extremely seriously.

“We carry out regular random drugs and alcohol testing to ensure that our rules are enforced throughout our supply chain.

“Any concerns about specific health and safety risks should be flagged to the management team on site.”

Construction work is ongoing (Image: PA)

Spurs are playing their home games at Wembley (Image: Tottenham Hotspur/Youtube)

Spurs announced the stadium delay last month, blaming issues with the “critical safety system”.

Mauricio Pochettino’s side are currently playing their ‘home’ games at Wembley Stadium.

The THFC Supporters’ Trust demanded refunds and compensation following the announcement.

Sources told Construction News earlier this week that the new stadium will not be ready until the first week of January.

Another insider said Spurs could potentially “write off the season” and not play their first game there until August next year.

But a club spokesman said: “We have always said we would issue updates for test events and official opening as soon as we have confidence in our project managers’ and contractors’ ability to deliver against the revised scheduled of works.

“This remains the case and speculating on unsupported dates such as this is irresponsible.”